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A082247 Multiples of 7 that are concatenation of 7 consecutive natural numbers. 5
3456789, 13141516171819, 20212223242526, 27282930313233, 34353637383940, 41424344454647, 48495051525354, 55565758596061, 62636465666768, 69707172737475, 76777879808182, 83848586878889, 90919293949596, 102103104105106107108, 109110111112113114115 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
From 2nd terms onwards it is observed that if a(r) ends in k then a(r+1) begins with k+1. This is true up to the term 90919293949596. (Why?)
LINKS
MATHEMATICA
Select[FromDigits[Flatten[IntegerDigits[#]]]&/@Partition[Range[100], 7, 1], Divisible[ #, 7]&] (* Harvey P. Dale, May 18 2021 *)
CROSSREFS
Sequence in context: A258510 A254997 A236356 * A036473 A154871 A206107
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Apr 11 2003
STATUS
approved

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Last modified March 3 00:46 EST 2024. Contains 370499 sequences. (Running on oeis4.)